Airline giant United has continued to shed dollars from its value, already wiping more than AU$1 billion lost as a result of the fallout of the video, which sparked an international scandal.

Dr Dao, 69, who is still recovering from his wounds in a Chicago hospital, was forcibly dragged from United Flight 3411 before it departed Chicago’s O’Hare International Airport on Sunday.

One passenger filmed officers ripping Dr Dao from his seat after he refused to comply with their orders to leave the flight so his seat could be offered to members of the airline’s crew.

White House press secretary Sean Spicer yesterday weighed in on the debate, labelling it “troubling”.

Dr Dao has reportedly filed an emergency petition to preserve records related to the incident, according to the Chicago Sun-Times.

The filing asks the court to order the airline to preserve surveillance video recordings depicting passenger boarding, the cockpit voice recording, the passenger list, the complete employee and crew list, and all incident reports prepared by the city and United.